WO2018127226A1 - Contention random access method and apparatus - Google Patents

Abstract

Provided are a contention random access method and apparatus. The method comprises: a terminal side device sends an Msg1 message corresponding to a two-step contention random access to a network side device; the terminal side device receives an Msg2 message returned by the network side device, and if the terminal side device determines two-step contention random access failure according to the reception condition of the Msg2 message, the terminal side device performs two-step contention random access failure processing, the Msg2 message being determined by the network side device according to the reception condition of the Msg1 message received by the network side device.

Description

Method and device for competing random access

Cross-reference to related applications

Priority is claimed on Japanese Patent Application No. 201710004130.6, filed on Jan. 4,,,,,,,,,,

Technical field

The embodiments of the present disclosure relate to the field of communications technologies, and in particular, to a method and apparatus for competing random access.

Background technique

The random access of the LTE system is divided into two types: contention random access and non-contention random access. Competitive random access is used for five purposes: 1) initial access of the terminal side device; radio resource control (RRC, Radio Resource Control) connection reestablishment; handover; downlink data arrival in the RRC connected state in the non-synchronized state; RRC connected state The uplink data arrives; the positioning in the RRC connected state. Non-competitive random access is used for handover, downlink data arrival, positioning, and acquisition of uplink timing.

The 5G system also supports the two types of competing random access as mentioned above, namely, contention random access and non-contention random access. Correspondingly, there is a need for a scheme suitable for a 5G system to perform a contention random access failure process.

Summary of the invention

In view of the above technical problem, embodiments of the present disclosure provide a method and apparatus for competing random access, which at least partially solves the technical problem of a scheme for competing random access failure processing that is applicable to a 5G system.

According to a first aspect of an embodiment of the present disclosure, a method for competing random access is provided, including:

The terminal side device sends the Msg1 message corresponding to the two-step contention random access to the network side device;

The terminal side device receives the Msg2 message replied by the network side device, and if the terminal side device determines that the two-step contention random access fails according to the receiving condition of the Msg2 message, performing a two-step contention random access failure process;

The Msg2 message is determined by the network side device according to the receiving condition that the network side device receives the Msg1 message.

Optionally, the Msg1 message carries at least a Random Access Preamble, and a data part.

Optionally, if only the Random Access Preamble is successfully received by the network side device in the Msg1 message, and the data part is not successfully received by the network side device, the terminal side device receives the Msg2 message receiving window or the timer corresponding to the Msg2 message before the timer expires. The Msg2 corresponding to the four-step competitive random access replied by the network side device is converted into four-step competitive random access.

Optionally, if the Random Access Preamble and the data part of the Msg1 message corresponding to the two-step contention random access are not successfully received, the terminal side device does not receive the timer corresponding to the Msg2 message receiving window or the Msg2 message. To Msg2, the terminal side device continues to try two-step contention random access until:

Two-step competition for random access success; or

The maximum number of total Random Access Preamble transmissions configured by the network side device for the terminal side device is determined, and the contention random access failure is determined; or

In the two-step contending random access process, if only the Random Access Preamble is successfully received by the network side device and the data part is not successfully received by the network side device, the terminal side device is successfully received by the network side device. The Msg2 message corresponding to the four-step contention random access replied by the network side device is received before the timer corresponding to the Msg2 message receiving window or the Msg2 message expires, and the terminal side device is converted into four-step contention random access.

Optionally, if the Random Access Preamble and the data part of the Msg1 message corresponding to the two-step contention random access are not successfully received, the terminal side device does not receive the Msg2 message receiving window or the timer corresponding to the Msg2 message. The Msg2 message, the terminal side device directly goes to the four-step competitive random access to try until:

Four-step competition random access success; or

The maximum number of total Random Access Preamble transmissions configured by the network side device for the terminal side device is determined, and the contention random access failure is determined.

Optionally, if the Random Access Preamble and the data part of the Msg1 message corresponding to the two-step contention random access are not successfully received, the terminal side device does not receive the Msg2 message receiving window or the timer corresponding to the Msg2 message. The Msg2 message, the terminal side device continues to try two-step contention random access until:

Two-step competition for random access success; or

After the maximum number of random access Preambles of the two-step contending random access configured by the network side device for the terminal side device is reached, the four-step contending random access is performed until the four-step contending random access succeeds, or the network side device is the terminal. The maximum number of transmissions of the total Random Access Preamble of the four-step contention random access configured by the side device determines that the contention random access fails; or

In the two-step contending random access process, if only the Random Access Preamble is successfully received by the network side device and the data part is not successfully received by the network side device, the terminal side device is successfully received by the network side device. The Msg2 message corresponding to the four-step contention random access replied by the network side device is received before the timer corresponding to the Msg2 message receiving window or the Msg2 message expires, and the terminal side device is converted into four-step contention random access.

Optionally, the data part includes but is not limited to one or a combination of the following: a terminal identifier, a scheduling request SR, a buffer status report BSR, and real service data.

Optionally, the Random Access Preamble and the data part are frequency division multiplexed FDM, or time division multiplexed TDM.

Optionally, each time the contention random access fails, the terminal side device randomly performs a two-step competitive random access attempt or a four-step competitive random access attempt according to the backoff backoff parameter configured by the network side device.

Optionally, the same backoff parameter is configured by the network side device or different backoff parameters are configured for the two-step contention random access and the four-step contention random access.

Optionally, adjusting the power ramping step parameter or configuring different power ramping step parameters for the two-step contention random access and the four-step contention random access by the network side device configured with the same output power; or

For the two-step contention random access, the power accessing step size of the Random Access Preamble and the data part in the Msg1 message corresponding to the two-step contention random access is different.

Optionally, if the terminal side device competes for random access and/or four-step contention random access, the total number of Random Access Preamble transmissions reaches the total number of total Random Access Preambles configured by the network side device for the terminal side device. Then, the higher layer is instructed to contend for the random access problem, and the high layer determines that the radio link of the terminal side device fails.

Optionally, the method further includes:

The terminal side device receives configuration information of a two-step contention random access related parameter of the network side device.

Optionally, the two-step contention random access related parameter includes but is not limited to one or a combination of the following parameters:

The maximum number of transmissions of the Random Access Preamble, the backoff parameter of the retry after the random access failure, the power ramping step parameter in the random access procedure, and the behavior of the terminal side device after the failure of the Msg1 message.

Optionally, the maximum number of transmissions of the Random Access Preamble includes one or a combination of the following:

The maximum number of Random Access Preamble transmissions for the two-step contention random access, the total number of Random Access Preamble transmissions for the four-step contention random access, and the total number of total Random Access Preamble transmissions.

Optionally, the behavior of the terminal side device after the partial or total acceptance of the Msg1 message fails includes, but is not limited to, the terminal side device continues to try the two-step contention random access, or the terminal side device continues to try the four-step contention random access. Or the terminal side device attempts N times two-step contending random access, and if it fails, tries four-step contending random access, where N is the maximum number of Random Access Preamble transmissions of the two-step contending random access.

According to a second aspect of the embodiments of the present disclosure, a competitive random access method is further provided, including:

The network side device receives the Msg1 message corresponding to the two-step contention random access sent by the terminal side device;

Determining, by the network side device, the Msg2 message according to the receiving condition of the Msg1 message, and replying the Msg2 message to the terminal side device, if the terminal side device determines the two-step competitive random access according to the receiving condition of the Msg2 message If the failure occurs, the terminal side device performs a two-step competitive random access failure process.

Optionally, if the Random Access Preamble and the data part of the Msg1 message corresponding to the two-step contention random access are successfully received, the network side device returns the Msg2 message corresponding to the two-step contention random access to the terminal side device; or

If only the Random Access Preamble is successfully received and the data part is not successfully received in the Msg1 message corresponding to the two-step contention random access, the network side device sends the Msg2 message receiving window or the timer corresponding to the Msg2 message to the terminal side before the timer expires. The device replies to the Msg2 message corresponding to the four-step competitive random access; or

If only the Random Access Preamble and the data part are not successfully received in the Msg1 message corresponding to the two-step contention random access, the network side device does not reply the Msg2 message to the terminal side device.

Optionally, if the Random Access Preamble in the Msg1 message corresponding to the two-step contention random access is not successfully received, only the data part is successfully received, and the network side device returns the Msg2 corresponding to the two-step contention random access to the terminal side device. Message.

Optionally, the RAPID in the Msg2 message uses a predetermined value, or uses a predetermined domain identifier in a RAR MAC PDU subheader or a MAC PDU.

Optionally, the method further includes:

The network side device sends configuration information of the two-step contention random access related parameter to the terminal side device.

Optionally, the two-step contention random access related parameter includes but is not limited to one or a combination of the following parameters:

The maximum number of transmissions of the Random Access Preamble, the backoff parameter of the retry after the random access failure, the power ramping step parameter in the random access procedure, and the behavior of the terminal side device after the failure of the Msg1 message.

Optionally, the maximum number of transmissions of the Random Access Preamble includes one or a combination of the following:

The maximum number of Random Access Preamble transmissions for the two-step contention random access, the total number of Random Access Preamble transmissions for the four-step contention random access, and the total number of total Random Access Preamble transmissions.

Optionally, for the two-step contention random access and the four-step contention random access, the network side device configures the same backoff parameter or configures different backoff parameters.

Optionally, for the two-step contention random access and the four-step contention random access, the network side device configures the same power ramping step parameter or configures different power ramping step parameters; or

For the two-step contention random access, the power accessing step size of the Random Access Preamble and the data part in the Msg1 message corresponding to the two-step contention random access is different.

According to the third aspect of the embodiments of the present disclosure, there is also provided a device for competing random access, which is applied to a terminal side device, and includes:

a first sending module, configured to send, to the network side device, a two-step Msg1 message corresponding to the random access; and

The first processing module is configured to receive the Msg2 message replied by the network side device, and if the terminal side device determines that the two-step contending random access fails according to the receiving condition of the Msg2 message, performing a two-step contending random access failure process;

The Msg2 message is determined by the network side device according to the receiving condition that the network side device receives the Msg1 message.

Optionally, the Msg1 message carries at least a Random Access Preamble, and a data part.

Optionally, the first processing module is further configured to:

If only the Random Access Preamble is successfully received by the network side device in the Msg1 message, and the data part is not successfully received by the network side device, the four-step contention randomized by the network side device is received before the timer corresponding to the Msg2 message receiving window or the Msg2 message times out. Access the corresponding Msg2 and convert it to four-step competitive random access.

Optionally, the first processing module is further configured to:

If the Random Access Preamble and the data part of the Msg1 message corresponding to the two-step contention random access are not successfully received, the terminal side device does not receive the Msg2 message before the timer corresponding to the Msg2 message receiving window or the Msg2 message expires. Continue to try two-step competitive random access until:

Two-step competition for random access success; or

The maximum number of total Random Access Preamble transmissions configured by the network side device for the terminal side device is determined, and the contention random access failure is determined; or

In the two-step contending random access procedure, if only the Random Access Preamble is successfully received by the network side device in the Msg1 message corresponding to the two-step contending random access, and the data part is not successfully received by the network side device, the Msg2 message receiving window is received. Or the Msg2 message corresponding to the four-step contention random access replied by the network side device is received before the timer corresponding to the Msg2 message expires, and converted into four-step contention random access.

Optionally, the first processing module is further configured to:

If the Random Access Preamble and the data part of the Msg1 message corresponding to the two-step contention random access are not successfully received, the Msg2 message is not received before the timer corresponding to the Msg2 message receiving window or the Msg2 message times, and the process directly goes to the four-step competition. Random access is attempted until:

Four-step competition random access success; or

The maximum number of total Random Access Preamble transmissions configured by the network side device for the terminal side device is determined, and the contention random access failure is determined.

Optionally, the first processing module is further configured to:

If the Random Access Preamble and the data part of the Msg1 message corresponding to the two-step contention random access are not successfully received, the Msg2 message is not received before the timer corresponding to the Msg2 message receiving window or the Msg2 message expires, and the two-step random competition is continued. Access until:

Two-step competition for random access success; or

After the maximum number of random access Preambles of the two-step contending random access configured by the network side device for the terminal side device is reached, the four-step contending random access is performed until the four-step contending random access succeeds, or the network side device is the terminal. The maximum number of transmissions of the total Random Access Preamble of the four-step contention random access configured by the side device determines that the contention random access fails; or

In the two-step contending random access procedure, if only the Random Access Preamble is successfully received by the network side device in the Msg1 message corresponding to the two-step contending random access, and the data part is not successfully received by the network side device, the Msg2 message receiving window is received. Or the Msg2 message corresponding to the four-step contention random access replied by the network side device is received before the timer corresponding to the Msg2 message expires, and converted into four-step contention random access.

Optionally, the data part includes but is not limited to one or a combination of the following: a terminal identifier, a scheduling request SR, a buffer status report BSR, and real service data.

Optionally, the Random Access Preamble and the data part are frequency division multiplexed FDM, or time division multiplexed TDM.

Optionally, the first processing module is further configured to:

Each time the contention random access fails, the two-step competitive random access attempt or the four-step competitive random access attempt is performed again according to the backoff parameter configured by the network side device.

Optionally, the same backoff parameter is configured by the network side device or different backoff parameters are configured for the two-step contention random access and the four-step contention random access.

Optionally, adjusting the power ramping step parameter or configuring different power ramping step parameters for the two-step contention random access and the four-step contention random access by the network side device configured with the same output power; or

For the two-step contention random access, the power accessing step size of the Random Access Preamble and the data part in the Msg1 message corresponding to the two-step contention random access is different.

Optionally, the first processing module is further configured to:

If the total number of Random Access Preamble transmissions of the two-step contention random access and/or the four-step contention random access of the terminal device reaches the total number of total Random Access Preambles configured by the network side device for the terminal side device, Indicates a contention random access problem, and the high layer determines that the terminal side device radio link fails.

Optionally, the device further includes:

The first receiving module is configured to receive configuration information of the two-step contention random access related parameter of the network side device.

Optionally, the two-step contention random access related parameter includes but is not limited to one or a combination of the following parameters:

The maximum number of transmissions of the Random Access Preamble, the backoff parameter of the retry after the random access failure, the power ramping step parameter in the random access procedure, and the behavior of the terminal side device after the failure of the Msg1 message.

Optionally, the maximum number of transmissions of the Random Access Preamble includes one or a combination of the following:

The maximum number of Random Access Preamble transmissions for the two-step contention random access, the total number of Random Access Preamble transmissions for the four-step contention random access, and the total number of total Random Access Preamble transmissions.

Optionally, the behavior of the terminal side device after the partial or total acceptance of the Msg1 message fails includes, but is not limited to, the terminal side device continues to try the two-step contention random access, or the terminal side device continues to try the four-step contention random access. Or the terminal side device attempts N times two-step contending random access, and if it fails, tries four-step contending random access, where N is the maximum number of Random Access Preamble transmissions of the two-step contending random access.

According to the fourth aspect of the embodiments of the present disclosure, there is also provided a device for competing random access, which is applied to a network side device, and includes:

a second receiving module, configured to receive a Msg1 message corresponding to the two-step contention random access sent by the terminal side device;

a second sending module, configured to determine an Msg2 message according to the receiving condition of the received Msg1 message, and reply the Msg2 message to the terminal side device, if the terminal side device determines that the two-step competition is random according to the receiving condition of the Msg2 message If the access fails, the terminal side device performs a two-step competitive random access failure process.

Optionally, the second sending module is further configured to:

If the Random Access Preamble and the data part of the Msg1 message corresponding to the two-step contention random access are successfully received, the Msg2 message corresponding to the two-step contention random access is returned to the terminal side device; or

If only the Random Access Preamble is successfully received and the data part is not successfully received in the Msg1 message corresponding to the two-step contention random access, the four-step competition is returned to the terminal side device before the timer corresponding to the Msg2 message receiving window or the Msg2 message expires. Random access to the corresponding Msg2 message; or

If only the Random Access Preamble and the data part are not successfully received in the Msg1 message corresponding to the two-step contention random access, the Msg2 message is not returned to the terminal side device.

Optionally, the second sending module is further configured to:

If the Random Access Preamble in the Msg1 message corresponding to the two-step contention random access is not successfully received, only the data part is successfully received, and the Msg2 message corresponding to the two-step contention random access is returned to the terminal side device.

Optionally, the RAPID in the Msg2 message uses a predetermined value, or uses a predetermined domain identifier in a RAR MAC PDU subheader or a MAC PDU.

Optionally, the device further includes:

And a third sending module, configured to send configuration information of the two-step contention random access related parameter to the terminal side device.

Optionally, the two-step contention random access related parameter includes but is not limited to one or a combination of the following parameters:

The maximum number of transmissions of the Random Access Preamble, the backoff parameter of the retry after the random access failure, the power ramping step parameter in the random access procedure, and the behavior of the terminal side device after the failure of the Msg1 message.

Optionally, the maximum number of transmissions of the Random Access Preamble includes one or a combination of the following:

The maximum number of Random Access Preamble transmissions for the two-step contention random access, the total number of Random Access Preamble transmissions for the four-step contention random access, and the total number of total Random Access Preamble transmissions.

Optionally, for the two-step contention random access and the four-step contention random access, the network side device configures the same backoff parameter or configures different backoff parameters.

Optionally, for the two-step contending random access and the four-step contending random access, the network side device is configured with the same power ramping step parameter or configured with different power ramping step parameters; or

For the two-step contention random access, the power accessing step size of the Random Access Preamble and the data part in the Msg1 message corresponding to the two-step contention random access is different.

According to a fifth aspect of the embodiments of the present disclosure, there is also provided a terminal side device, comprising: a processor, a memory, and a computer program stored on the memory and operable on the processor, the computer program being The processor, when executed, implements the steps in the contention random access method as described in the first aspect.

According to a sixth aspect of the embodiments of the present disclosure, there is also provided a network side device, comprising: a processor, a memory, and a computer program stored on the memory and operable on the processor, the computer program being The processor, when executed, implements the steps in the contention random access method as described in the second aspect.

According to a seventh aspect of the embodiments of the present disclosure, there is also provided a computer readable storage medium having stored thereon a computer program, the computer program being executed by a processor, as in the first aspect The steps in the competitive random access method.

According to an eighth aspect of embodiments of the present disclosure, there is also provided a computer readable storage medium having stored thereon a computer program, the computer program being executed by a processor, as in the second aspect The steps in the competitive random access method.

One technical solution of the foregoing technical solution has the following advantages or advantages: the network side device determines how to reply to the Msg2 message according to the receiving condition of the Msg1 message, and the terminal side device determines the two-step competition randomly according to the reply condition of the Msg2 message of the network side device. If the access fails, the two-step random access processing is performed, and a technical solution for determining the two-step random access failure processing is determined, so that the random access process of the 5G system can be further improved.

DRAWINGS

In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only the present disclosure. Some embodiments of the text may also be used to obtain other figures from these figures without departing from the art.

1 is a schematic diagram of an LTE four-step contention random access procedure according to the related art;

2 is a schematic diagram of a three-step non-contention random access procedure of an LTE system according to the related art;

3 is a schematic diagram of a two-step competitive random access procedure introduced by a 5G system according to the related art;

4 is a flowchart of a method for competing for random access in Embodiment 1 of the present disclosure;

FIG. 5 is a flowchart of a method for competing for random access in Embodiment 2 of the present disclosure;

6 is a flowchart of a method for competing for random access in Embodiment 3 of the present disclosure;

7 is a flowchart of a method for competing random access in Embodiment 4 of the present disclosure;

8 is a block diagram of an apparatus for competing for random access in Embodiment 5 of the present disclosure;

9 is a block diagram of an apparatus for competing for random access in Embodiment 6 of the present disclosure;

10 is a schematic structural diagram of a terminal side device according to Embodiment 7 of the present disclosure;

FIG. 11 is a schematic structural diagram of a network side device according to Embodiment 8 of the present disclosure.

detailed description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While the embodiments of the present invention have been shown in the drawings, the embodiments Rather, these embodiments are provided so that this disclosure will be more fully understood, and the scope of the disclosure may be fully conveyed to those skilled in the art.

First, a brief introduction to the random access process of the LTE system and the two-step random access procedure introduced in the 5G system are briefly introduced.

(1) Random access of LTE system

The random access of the LTE system is divided into two types: contention random access and non-contention random access. The process is as follows.

Competitive random access is used for five purposes: 1) initial access of the terminal side device; radio resource control (RRC, Radio Resource Control) connection reestablishment; handover; downlink data arrival in the RRC connected state in the non-synchronized state; RRC connected state The uplink data arrives; the positioning in the RRC connected state. The process is shown in Figure 1, which is divided into four steps:

Msg1: The UE selects a random access preamble (random access preamble) and a PRACH (Physical Random Access Channel) resource and uses the PRACH resource to send the selected random access preamble to the base station.

Msg2: The base station receives the preamble, calculates a timing advance TA (Time Alignment), and sends a random access response to the UE. The random access response includes the timing advance information and the UL grant for Msg3, and the network side device allocation. Temporary Cell Radio Network Temporary Identifier (C-RNTI). The PDCCH carrying the Msg2 scheduling message is scrambled by the RA-RNTI, and the RA-RNTI uniquely corresponds to the time-frequency resource of the Msg1 in the 10ms window. In addition, the Msg2 also carries the preamble ID, and the UE temporarily identifies the radio network by random access (RA- The RNTI (Random Access Radio Network Temporary Identifier) and the preamble ID determine that the Msg2 corresponds to the Msg1 sent by it.

Msg3: The UE sends an uplink transmission on the UL grant specified by the Msg2. The content of the Msg3 uplink transmission is different for different random access reasons. For example, for the initial access, the Msg3 transmits an RRC connection establishment request.

Msg4: The contention resolution message, the UE can judge whether the random access is successful according to Msg4. For the initial access UE, after the contention resolution is successful, the temporary C-RNTI is automatically converted into the UE's unique UE identity C-RNTI in the cell.

Non-contention random access is used for handover, downlink data arrival, location, and acquisition of uplink timing. The process is shown in Figure 2 and is mainly divided into three steps:

Msg0: The base station allocates a dedicated preamble for non-contention random access and a PRACH resource used for random access to the UE.

Msg1: The UE sends the designated dedicated preamble to the base station on the designated PRACH resource according to the indication of Msg0. After receiving the Msg1, the base station calculates the uplink timing advance TA according to Msg1.

Msg2: The base station sends a random access response to the UE. The random access response includes timing advance information and a subsequent uplink transmission resource allocation UL grant, and the timing advance is used for the timing relationship of the UE subsequent uplink transmission.

(2) New two-step random access process introduced in 5G system

For competitive random access, in order to shorten the random access delay, the 5G system supports two-step random access in addition to the four-step random access of the current LTE system. The flow of two-step random access is shown in Figure 3.

The 5G system supports two types of competing random access: two-step competitive random access and four-step competitive random access.

Embodiment 1

Referring to FIG. 4, a flow of a competitive random access method is shown, and the specific steps are as follows:

Step 401: The terminal side device sends a two-step Msg1 message corresponding to the random access to the network side device.

Step 402: The terminal side device receives the Msg2 message replied by the network side device, and if the terminal side device determines that the two-step contention random access fails according to the receiving condition of the Msg2 message, performing a two-step contention random access failure process;

The Msg2 message is determined by the network side device according to the receiving condition that the network side device receives the Msg1 message.

The reception status of the above Msg2 message can be divided into a case where an Msg2 message is received and a case where an Msg2 message is not received. The receiving the Msg2 message may refer to: receiving the Msg2 message corresponding to the four-step contention random access. In addition, the Msg2 message is not received. The terminal side device does not receive the Msg2 message before the timer corresponding to the Msg2 message receiving window or the Msg2 timer expires.

In this embodiment, optionally, the Msg1 message carries at least a Random Access Preamble, and a data part. Optionally, the data part includes but is not limited to one or a combination of the following: a terminal identifier, a scheduling request SR, a buffer status report BSR, and real service data.

Further, the Random Access Preamble and the data portion are frequency division multiplexed FDM, or time division multiplexed TDM.

The receiving condition of the above Msg1 message can be divided into: First, the Random Access Preamble in the Msg1 message, and the data part are successfully received. Second, the Random Access Preamble in the Msg1 message was not successfully received, but the data portion was successfully received. Third, the Random Access Preamble in the Msg1 message, as well as the data portion, were not successfully received.

In this embodiment, the terminal side device determines whether the two-step contention random access fails according to the reply condition of the Msg2 message of the network side device. The Msg2 message is determined by the network side device according to the receiving condition of the Msg1 message. If the two-step competitive random access fails, the two-step competitive random access processing is performed, and a two-step random access failure is provided. The technical solution of the processing enables the random access process of the 5G system to be further improved.

After determining the two-step random access failure, the terminal side device may further determine the subsequent processing after the two-step random access failure according to the receiving condition of the Msg2 message, so that the random access procedure of the 5G system can be more perfect. That is, performing the two-step contention random access failure processing in step 402 may mean:

In step 402, if only the Random Access Preamble is successfully received by the network side device in the Msg1 message, and the data part is not successfully received by the network side device, the terminal side device receives the Msg2 message receiving window or the timer corresponding to the Msg2 before the timer expires. The Msg2 message corresponding to the four-step competitive random access replied by the network side device is converted into four-step competitive random access.

In step 402, if the Random Access Preamble and the data part of the Msg1 message corresponding to the two-step contention random access are not successfully received, the terminal side device does not receive the Msg2 message receiving window or the timer corresponding to the Msg2. To the Msg2 message, the terminal side device continues to try two-step contention random access until:

Two-step competition for random access success; or

The maximum number of total Random Access Preamble transmissions configured by the network side device for the terminal side device is determined, and the contention random access failure is determined; or

In step 402, in the two-step contending random access procedure, if only the Random Access Preamble is successfully received by the network side device in the Msg1 message corresponding to the two-step contending random access, and the data part is not successfully received by the network side device, The terminal side device receives the Msg2 message corresponding to the four-step contention random access replied by the network side device before the Msg2 receiving window or the timer corresponding to the Msg2 expires, and the terminal side device converts into four-step contention random access.

In step 402, performing the two-step contention random access failure process means that if the Random Access Preamble and the data part in the Msg1 message corresponding to the two-step contention random access are not successfully received, the terminal side device receives the message in the Msg2 message. The Msg2 message is not received before the timer corresponding to the window or the Msg2 message expires, and the terminal side device directly transfers to the four-step contention random access to try until:

Four-step competition random access success; or

The maximum number of total Random Access Preamble transmissions configured by the network side device for the terminal side device is determined, and the contention random access failure is determined.

In step 402, performing the two-step contention random access failure process means that if the Random Access Preamble and the data part in the Msg1 message corresponding to the two-step contention random access are not successfully received, the terminal side device receives the message in the Msg2 message. The Msg2 message is not received before the timer corresponding to the window or the Msg2 message expires. The terminal device continues to try the two-step contention random access until:

Two-step competition for random access success; or

After the maximum number of random access Preambles of the two-step contending random access configured by the network side device for the terminal side device is reached, the four-step contending random access is performed until the four-step contending random access succeeds, or the network side device is the terminal. The maximum number of transmissions of the total Random Access Preamble of the four-step contention random access configured by the side device determines that the contention random access fails; or

In the two-step contending random access process, if only the Random Access Preamble is successfully received by the network side device and the data part is not successfully received by the network side device, the terminal side device is successfully received by the network side device. The Msg2 message corresponding to the four-step contention random access replied by the network side device is received before the Msg2 receiving window or the timer corresponding to the Msg2 expires, and the terminal side device is converted into four-step competitive random access.

In this embodiment, each time the contention random access fails, the terminal side device randomly performs a two-step competitive random access attempt or four-step competitive random access according to the backoff backoff parameter configured by the network side device. try.

In this embodiment, the same backoff parameter or the different backoff parameters are configured by the network side device for the two-step contention random access and the four-step contention random access.

In this embodiment, the power ramping step parameter or the different power ramping step parameter is configured by configuring the same output power for the network side device for the two-step contention random access and the four-step contention random access; or

For the two-step contention random access, the power accessing step size of the Random Access Preamble and the data part in the Msg1 message corresponding to the two-step contention random access is different.

In this embodiment, if the terminal side device competes for random access and/or four-step contention random access, the total number of Random Access Preamble transmissions reaches the total number of total Random Access Preambles configured by the network side device for the terminal side device. After the number of times, the higher layer is instructed to contend for the random access problem, and the high layer determines that the terminal side device wireless link access fails.

In this embodiment, the method further includes: the terminal side device receiving configuration information of the two-step contention random access related parameter of the network side device.

In this embodiment, the two-step contention random access related parameter includes but is not limited to one or a combination of the following parameters:

The maximum number of transmissions of the Random Access Preamble, the backoff parameter of the retry after the random access failure, the power ramping step parameter in the random access procedure, and the behavior of the terminal side device after the failure of the Msg1 message.

In this embodiment, the maximum number of transmissions of the Random Access Preamble includes one or a combination of the following:

The maximum number of Random Access Preamble transmissions for the two-step contention random access, the total number of Random Access Preamble transmissions for the four-step contention random access, and the total number of total Random Access Preamble transmissions.

In this embodiment, the behavior of the terminal side device after the partial or total acceptance of the Msg1 message fails includes, but is not limited to, the terminal side device continues to try the two-step contention random access, or the terminal side device continues to try the four-step contention random connection. Incoming, or the terminal side device attempts N times two-step contending random access, and if it fails, tries four-step contending random access, where N is the total number of Random Access Preamble transmissions of the two-step contending random access.

In this embodiment, the terminal side device determines whether the two-step contention random access fails according to the reply condition of the Msg2 message of the network side device. The Msg2 message is determined by the network side device according to the receiving condition of the Msg1 message. If the two-step competitive random access fails, the two-step competitive random access processing is performed, and a two-step random access failure is provided. The technical solution of the processing enables the random access process of the 5G system to be further improved.

Further, the terminal side device can determine the subsequent processing mode of the two-step random calculation failure according to the reply condition of the Msg2 message of the network side device, so that the random access process of the 5G system can be more perfect.

Embodiment 2

Referring to FIG. 5, a flow of a competitive random access method is shown, and the specific steps are as follows:

Step 501: The network side device receives the Msg1 message corresponding to the two-step contention random access sent by the terminal side device.

In this embodiment, optionally, the Msg1 message carries at least a Random Access Preamble, and a data part. Optionally, the data part includes but is not limited to one or a combination of the following: a terminal identifier, a scheduling request SR, a buffer status report BSR, and real service data.

Further, the Random Access Preamble and the data portion are frequency division multiplexed FDM or time division multiplexed TDM.

Step 502: The network side device determines the Msg2 message according to the receiving condition of the Msg1 message, and returns an Msg2 message to the terminal side device, if the terminal side device determines the two-step contention random connection according to the receiving condition of the Msg2 message. If the entry fails, the terminal side device performs a two-step competitive random access failure process.

The receiving condition of the above Msg1 message can be divided into: First, the Random Access Preamble in the Msg1 message, and the data part are successfully received. Second, the Random Access Preamble in the Msg1 message was not successfully received, but the data portion was successfully received. Third, the Random Access Preamble in the Msg1 message, as well as the data portion, were not successfully received.

The reception status of the above Msg2 message can be divided into a case where an Msg2 message is received and a case where an Msg2 message is not received. The receiving the Msg2 message may refer to: receiving the Msg2 message corresponding to the four-step contention random access. If the Msg2 message is not received, the terminal device may not receive the Msg2 message before the Msg2 message receiving window or the timer corresponding to the Msg2 expires.

In this embodiment, if the Random Access Preamble and the data part of the Msg1 message corresponding to the two-step contention random access are successfully received, the network side device returns the Msg2 message corresponding to the two-step contention random access to the terminal side device; or

If only the Random Access Preamble is successfully received and the data part is not successfully received in the Msg1 message corresponding to the two-step contention random access, the network side device replies to the terminal side device before the Msg2 receiving window or the timer corresponding to the Msg2 expires. Four-step competition random access corresponding Msg2 message; or

If only the Random Access Preamble and the data part are not successfully received in the Msg1 message corresponding to the two-step contention random access, the network side device does not reply the Msg2 message to the terminal side device.

In this embodiment, if the Random Access Preamble in the Msg1 message corresponding to the two-step contention random access is not successfully received, only the data part is successfully received, and the network side device returns a two-step contention random access corresponding to the terminal side device. Msg2 message.

In this embodiment, the RAPID in the Msg2 message uses a predetermined value, or uses a predetermined domain identifier in a RAR MAC PDU subheader or a MAC PDU.

In this embodiment, the method further includes: the network side device sending configuration information of the two-step contention random access related parameter to the terminal side device.

Optionally, the two-step contention random access related parameter includes but is not limited to one or a combination of the following parameters:

The maximum number of transmissions of the Random Access Preamble, the backoff parameter of the retry after the random access failure, the power ramping step parameter in the random access procedure, and the behavior of the terminal side device after the failure of the Msg1 message.

Optionally, the maximum number of transmissions of the Random Access Preamble includes one or a combination of the following:

The maximum number of Random Access Preamble transmissions for the two-step contention random access, the total number of Random Access Preamble transmissions for the four-step contention random access, and the total number of total Random Access Preamble transmissions.

In this embodiment, for the two-step contention random access and the four-step contention random access, the network side device configures the same backoff parameter or configures different backoff parameters.

In this embodiment, for the two-step contending random access and the four-step contending random access, the network side device is configured with the same power ramping step parameter or configured with different power ramping step parameters; or

For the two-step contention random access, the random access Preamble and the data portion of the Msg1 message corresponding to the two-step contention random access have different power ramping steps.

In this embodiment, the network side device determines how to reply to the Msg2 message according to the receiving condition of the Msg1 message, and the terminal side device performs two steps according to the reply condition of the Msg2 message of the network side device, if it is determined that the two-step contention random access fails. The process of competing random access provides a technical solution for determining the two-step random access failure processing, so that the random access process of the 5G system can be further improved.

Further, the terminal side device may further determine the subsequent processing manner of the two-step random calculation failure according to the reply condition of the Msg2 message of the network side device, so that the random access process of the 5G system can be more perfect.

Embodiment 3

Referring to FIG. 6, the flow of the processing method after the two-step competitive random access failure is shown, and the specific steps are as follows:

Step 601: The terminal side device receives random access related parameter configuration information of the network side device.

The network needs to be configured for the terminal side device side, but is not limited to one or a combination of the following parameters: the maximum number of transmissions of the Random Access Preamble, the backoff parameter that is tried again after the two-step contention random access failure, and the power ramping in the two-step contention random access process. Part or all of the step size parameter and the two-step contention random access Msg1 message accept the behavior of the terminal side device after the failure.

Random access related parameters are mainly configured through broadcast. Alternatively, some parameters of the random access related parameters (such as the Backoff parameter) may also be configured through the MAC layer (for example, carried in the MAC sub-header of the RAR MAC PDU).

In this embodiment, the maximum number of transmissions of the Random Access Preamble includes one or a combination of the maximum number of Random Access Preamble transmissions of the two-step contention random access and the total number of total Random Access Preamble transmissions.

In this embodiment, the same value may be used for the backoff parameter of the two-step contention random access and the four-step contention random access, and different values may also be used.

In this embodiment, for two-step contention random access and four-step contention random access: network side devices may be configured with the same or different power ramping step sizes; or for two-step contention random access: two-step random access Random The power ramping step size of the Access Preamble and data sections can be different.

In this embodiment, the behavior of the terminal side device after the partial or complete acceptance of the two-step contention random access Msg1 message includes, but is not limited to, continuing to try the two-step competitive random access, or continuing to try the four-step competitive random access. Or try N times two-step contending random access (N is the maximum number of Random Access Preamble transmissions for two-step contending random access), and if it fails, try four-step contending random access.

Step 602: The terminal side device determines that the two-step random access is triggered, and the terminal side device sends the Msg1 message to the network side device.

In this embodiment, Msg1 carries at least: a Random Access Preamble, and a data portion.

The above data portion may include one or a combination of the following: UE identity, SR, BSR, and real service data.

The above Random Access Preamble and data parts can be either FDM or TDM.

Step 603: The network side device receives the Msg1 message, and determines the Msg2 replied to the terminal side device according to the Msg1 message.

That is, the network side device determines how to reply to Msg2 according to the reception status of the Msg1 message.

If the two-step random access to the Random Access Preamble and the data portion (including the UE identity and/or the SR and/or the BSR and/or the real service data) in the Msg1 are successfully received, it is determined that the two-step competitive random access is successful. The network side device replies to the terminal side device with the Msg2 corresponding to the two-step competitive random access.

If the Random Access Preamble in the two-step contention random access Msg1 message is unsuccessful, but the data part (including the UE identity and/or SR and/or BSR and/or real service data) is successfully received, then the two-step competition can also be judged. After the random access is successful, the network side device replies to the terminal side device with the Msg2 corresponding to the two-step competitive random access. The RAPID uses a special value or uses a special domain identifier in the RAR MAC PDU subheader or MAC PDU.

The above two methods are two-step competitive random access successful processing. The following describes the processing after the random access failure.

A possible scenario for the failure of competing random access is:

If only the Random Access Preamble is successfully received in the two-step contention random access Msg1 message, and the data part (including the UE identity and/or the SR and/or the BSR and/or the real service data) is not successfully received, the second decision is made. The step-by-step random access fails. At this time, the network side device replies to the terminal side device with the Msg2 message corresponding to the four-step contention random access.

Step 604: The terminal side device performs subsequent processing according to the Msg2 message, if it is determined that the two-step contention random access fails.

If only the Random Access Preamble is successfully received in the two-step contention random access Msg1 message, and the data part (including the UE identity and/or the SR and/or the BSR and/or the real service data) is not successfully received, the terminal side device receives The network side device replies to the Msg2 message corresponding to the four-step contention random access, and after receiving the Msg2 message, the terminal side device converts to the four-step contention random access.

If the four-step contention random access still fails, the total number of Random Access Preamble transmissions of the terminal-side device for two-step contention random access and four-step contention random access does not reach the total number of total Random Access Preambles configured by the network for the terminal-side device. The terminal side device generates a random backoff value between the [0, backoff parameters] according to the system information or the backoff mechanism carried in the MAC sub-header of the RAR MAC PDU, and initiates a four-step contention random connection according to the back-off value. In. For the two-step competitive random access and four-step competitive random access network side devices, the same or different power ramping step sizes can be configured. If the network side device is configured with different power ramping step lengths, the four-step contention random access uses its corresponding power ramping step length to determine the Random Access Preamble transmission power.

If the total number of Random Access Preamble transmissions of the two-step contending random access and the four-step contending random access of the terminal device reaches the total number of total Random Access Preambles configured by the network for the terminal side device, the RRC layer is sent to the terminal side device. Instructing the random access problem, the RRC layer of the terminal side device determines that the radio link access of the terminal side device fails.

Embodiment 4

Referring to FIG. 7, the flow of the processing method after the two-step competition random access failure is shown, and the specific steps are as follows:

Step 701: The terminal side device receives random access related parameter configuration information of the network side device.

The network needs to be configured for the terminal side device side, but is not limited to one or a combination of the following parameters: the maximum number of transmissions of the Random Access Preamble, the backoff parameter that is tried again after the random access failure, the power ramping step parameter in the two-step random access process, and Part or all of the two-step contention random access Msg1 message accepts the behavior of the terminal side device after the failure.

The parameters related to the random access are mainly configured by broadcast, or some parameters of the random access related parameters (such as the Backoff parameter) may also be configured through the MAC layer (for example, carried in the MAC sub-header of the RAR MAC PDU).

In this embodiment, the maximum number of transmissions of the Random Access Preamble includes one or a combination of the maximum number of Random Access Preamble transmissions of the two-step contention random access and the total number of total Random Access Preamble transmissions.

In this embodiment, the same value may be used for the backoff parameter of the two-step contention random access and the four-step contention random access, and different values may also be used.

In this embodiment, the two-step contention random access and the four-step contention random access network side device may be configured with the same or different power ramping step sizes; or for the two-step contention random access, the two-step random access Random Access The power ramping step size of the Preamble and data sections can be different.

In this embodiment, the behavior of the terminal side device after the partial or complete acceptance of the two-step contention random access Msg1 message includes: continuing to try two-step contention random access, or continuing to try four-step contention random access, or attempting to N The second two steps compete for random access (N is the total number of Random Access Preambles for two-step competitive random access), and if it fails, try four-step random access.

Step 702: The terminal side device determines that the two-step random access is triggered, and the terminal side device sends the Msg1 message to the network side device.

The Msg1 message carries at least: the Random Access Preamble, and the data part.

In this embodiment, the data part may include one or a combination of the following: UE identity, SR, BSR, and real service data.

The Random Access Preamble and data part can be either FDM or TDM.

Step 703: The network side device receives the Msg1 message, and determines the replied Msg2 message according to the Msg1 message.

That is, the network side device determines how to reply to the Msg2 message according to the reception status of the Msg1 message.

If the two-step random access to the Random Access Preamble and the data portion (including the UE identity and/or the SR and/or the BSR and/or the real service data) in the Msg1 are successfully received, it is determined that the two-step competitive random access is successful. The network side device replies to the terminal side device with the Msg2 message corresponding to the two-step contention random access.

If the Random Access Preamble in the two-step contention random access Msg1 message is unsuccessful, but the data part (including the UE identity and/or SR and/or BSR and/or real service data) is successfully received, then the two-step competition can also be judged. The random access is successful, and the network side device replies to the terminal side device with the Msg2 message corresponding to the two-step contention random access, where the RAPID uses a special value, or uses a special domain identifier in the RAR MAC PDU subheader or the MAC PDU.

Both of the above are the processing of two-step competitive random access. The following describes the processing after the failure of the random access.

A possible scenario for the failure of competing random access is:

If the two-step contention random access Msg1 message in the Random Access Preamble and the data part (including the UE identity and / or SR and / or BSR and / or real service data) are not successfully received, then the two-step competition is determined to be random The access fails. At this time, the network side device does not reply the Msg2 message to the terminal side device.

Step 704: The terminal side device performs subsequent processing according to the Msg2 message, if it is determined that the two-step contention random access fails.

If the two-step contention random access Msg1 message in the Random Access Preamble and the data part (including the UE identity and / or SR and / or BSR and / or real service data) are not successfully received, there are the following three processes, specifically Which processing method is used may be determined by the terminal device itself, or may be configured by a network side device or a protocol.

Optional one: The terminal-side device continues to try two-step competitive random access until:

Competitive random access is successful; or,

The maximum number of total Random Access Preamble transmissions of the network side device terminal device configuration is determined, and the contention random access failure is determined; or

If the Random Access Preamble mentioned in Embodiment 3 is successfully received in the two-step random access procedure, but the data part is unsuccessfully received, it is processed according to Embodiment 3.

Option 2: The terminal-side device directly goes to the four-step competitive random access to try until:

Competitive random access is successful; or,

The total number of total Random Access Preamble transmissions of the network side device terminal device configuration is determined, and the contention random access failure is determined;

Option 3: The terminal-side device continues to try two-step competitive random access until:

Competitive random access is successful; or,

After the maximum number of Random Access Preambles of the two-step contention random access of the two-step contention random access configured by the network side device is reached, the four-step contention random access is performed until the four-step contention random access succeeds or the network is configured for the terminal side device. The total number of transmissions of the total Random Access Preamble, the decision to compete for random access failure; or,

If the Random Access Preamble mentioned in Embodiment 3 is successfully received in the two-step random access procedure, but the data part is unsuccessfully received, it is processed according to Embodiment 3.

For the above three optional treatment methods:

If the total number of Random Access Preamble transmissions of the two-step contention random access and the four-step contention random access of the terminal device does not reach the total number of total Random Access Preambles configured by the network for the terminal side device, the random access attempt is allowed to continue. Each random access attempt terminal side device generates a random backoff value between [0, backoff parameters] according to the system information or the backoff mechanism carried in the MAC sub-header of the RAR MAC PDU, and initiates four again according to the back-off value. Step competition for random access. For the two-step competitive random access and four-step competitive random access network side devices, the same or different power ramping step sizes can be configured. If the network side device is configured with different power ramping step lengths, the two-step contention random access uses its corresponding power ramping step length to determine the Random Access Preamble transmission power. Correspondingly, the four-step competitive random access uses its corresponding power ramping step length to determine the Random Access Preamble transmit power.

If the total number of Random Access Preamble transmissions of the two-step contending random access and the four-step contending random access of the terminal device reaches the total number of total Random Access Preambles configured by the network for the terminal side device, the RRC layer is sent to the terminal side device. Instructing the random access problem, the RRC layer of the terminal side device determines that the radio link access of the terminal side device fails.

Embodiment 5

Referring to FIG. 8, a device for competing random access is applied to a terminal side device, and the device 800 includes:

The first sending module 801 is configured to send, to the network side device, the Msg1 message corresponding to the two-step contention random access; and

The first processing module 802 is configured to receive the Msg2 message replied by the network side device, and if the terminal side device determines that the two-step contention random access fails according to the receiving condition of the Msg2 message, perform a two-step competitive random access failure process. ;

The Msg2 message is determined by the network side device according to the receiving condition that the network side device receives the Msg1 message.

In this embodiment, optionally, the Msg1 message carries at least a Random Access Preamble, and a data part.

The receiving condition of the Msg2 message may be divided into the case of receiving the Msg2 message and the case of not receiving the Msg2 message. The receiving the Msg2 message may refer to: receiving the Msg2 message corresponding to the four-step contention random access; The Msg2 message may be that the terminal side device does not receive the Msg2 message before the Msg2 message receiving window or the timer corresponding to the Msg2 times out.

In this embodiment, the first processing module 802 is further configured to: if only the Random Access Preamble is successfully received by the network side device in the Msg1 message, and the data part is not successfully received by the network side device, the Msg2 receiving window or the timing corresponding to the Msg2 Before the timeout expires, the Msg2 corresponding to the four-step competitive random access replied by the network side device is received, and converted into four-step competitive random access.

In this embodiment, optionally, the Msg1 message carries at least a Random Access Preamble, and a data part. Optionally, the data part includes but is not limited to one or a combination of the following: a terminal identifier, a scheduling request SR, a buffer status report BSR, and real service data.

Further, the Random Access Preamble and the data portion are frequency division multiplexed FDM or time division multiplexed TDM.

The receiving condition of the above Msg1 message can be divided into: First, the Random Access Preamble in the Msg1 message, and the data part are successfully received. Second, the Random Access Preamble in the Msg1 message was not successfully received, and the data portion was successfully received. Third, the Random Access Preamble in the Msg1 message, as well as the data portion, were not successfully received.

In this embodiment, the terminal side device determines whether the two-step contention random access fails according to the reply condition of the Msg2 message of the network side device, where the Msg2 message is determined by the network side device according to the receiving condition of the Msg1 message, if two steps are decided. If the random access fails, the two-step random access processing is performed, and a technical solution for performing the two-step random access failure processing is provided, so that the random access process of the 5G system can be further improved.

After determining the two-step random access failure, the terminal side device may further determine the subsequent processing after the two-step random access failure according to the receiving condition of the Msg2 message, so that the random access procedure of the 5G system can be more perfect.

In this embodiment, the first processing module 802 is further configured to: if the Random Access Preamble and the data part in the Msg1 message corresponding to the two-step contention random access are not successfully received, the terminal side device receives the window in the Msg2 or If the timer corresponding to Msg2 fails to receive Msg2 before timeout, continue to try two-step competitive random access until:

Two-step competition for random access success; or

The maximum number of total Random Access Preamble transmissions configured by the network side device for the terminal side device is determined, and the contention random access failure is determined; or

In the two-step contending random access process, if only the Random Access Preamble is successfully received by the network side device and the data part is not successfully received by the network side device, the terminal side device is successfully received by the network side device. The Msg2 message corresponding to the four-step contention random access replied by the network side device is received before the Msg2 receiving window or the timer corresponding to the Msg2 expires, and converted into a four-step competitive random access.

In this embodiment, the first processing module 802 is further configured to: if the Random Access Preamble and the data part of the Msg1 message corresponding to the two-step contention random access are not successfully received, the timer corresponding to the Msg2 receiving window or the Msg2 is timed out. Before receiving Msg2, go directly to the four-step competitive random access and try until:

Four-step competition random access success; or

The maximum number of total Random Access Preamble transmissions configured by the network side device for the terminal side device is determined, and the contention random access failure is determined.

In this embodiment, the first processing module 802 is further configured to: if the Random Access Preamble and the data part of the Msg1 message corresponding to the two-step contention random access are not successfully received, the timer corresponding to the Msg2 receiving window or the Msg2 is timed out. Before receiving Msg2, continue to try two-step competitive random access until:

Two-step competition for random access success; or

After the maximum number of random access Preambles of the two-step contending random access configured by the network side device for the terminal side device is reached, the four-step contending random access is performed until the four-step contending random access succeeds, or the network side device is the terminal. The maximum number of transmissions of the total Random Access Preamble of the four-step contention random access configured by the side device determines that the contention random access fails; or

In the two-step contending random access process, if only the Random Access Preamble is successfully received by the network side device and the data part is not successfully received by the network side device, the terminal side device is successfully received by the network side device. The Msg2 message corresponding to the four-step contention random access replied by the network side device is received before the Msg2 receiving window or the timer corresponding to the Msg2 expires, and converted into a four-step competitive random access.

In this embodiment, the data part includes but is not limited to one or a combination of the following: a terminal identifier, a scheduling request SR, a buffer status report BSR, and real service data.

In this embodiment, the Random Access Preamble and the data part are frequency division multiplexed FDM, or time division multiplexed TDM.

In this embodiment, the first processing module is further configured to:

Each time the contention random access fails, the two-step competitive random access attempt or the four-step competitive random access attempt is performed again according to the backoff parameter configured by the network side device.

In this embodiment, the same backoff parameter or the different backoff parameters are configured by the network side device for the two-step contention random access and the four-step contention random access.

In this embodiment, the power ramping step parameter or the different power ramping step parameter is configured by configuring the same output power for the network side device for the two-step contention random access and the four-step contention random access; or

For the two-step contention random access, the power accessing step size of the Random Access Preamble and the data part in the Msg1 message corresponding to the two-step contention random access is different.

In this embodiment, the first processing module is further configured to: if the terminal side device competes for random access and/or four-step contention random access, the total number of Random Access Preamble transmissions reaches the network side device as the terminal side device. After the maximum number of total Random Access Preambles is configured, the higher layer is instructed to contend for the random access problem, and the high layer determines that the terminal side device wireless link access fails.

In this embodiment, the apparatus further includes: a first receiving module, configured to receive configuration information of a two-step contention random access related parameter of the network side device.

Optionally, the two-step contention random access related parameter includes but is not limited to one or a combination of the following parameters:

The maximum number of transmissions of the Random Access Preamble, the backoff parameter of the retry after the random access failure, the power ramping step parameter in the random access procedure, and the behavior of the terminal side device after the failure of the Msg1 message.

Optionally, the maximum number of transmissions of the Random Access Preamble includes one or a combination of the following:

The maximum number of Random Access Preamble transmissions for the two-step contention random access, the total number of Random Access Preamble transmissions for the four-step contention random access, and the total number of total Random Access Preamble transmissions.

Optionally, the behavior of the terminal side device after the partial or total acceptance of the Msg1 message fails includes, but is not limited to, the terminal side device continues to try the two-step contention random access, or the terminal side device continues to try the four-step contention random access. Or the terminal side device attempts N times two-step contending random access, and if it fails, tries four-step contending random access, where N is the maximum number of Random Access Preamble transmissions of the two-step contending random access.

In this embodiment, the terminal side device determines whether the two-step contention random access fails according to the reply condition of the Msg2 message of the network side device, where the Msg2 message is determined by the network side device according to the receiving condition of the Msg1 message, if two steps are decided. If the random access fails, the two-step random access processing is performed, and a technical solution for performing the two-step random access failure processing is provided, so that the random access process of the 5G system can be further improved.

Further, the terminal side device can determine the subsequent processing mode of the two-step random calculation failure according to the reply condition of the Msg2 message of the network side device, so that the random access process of the 5G system can be more perfect.

Embodiment 6

Referring to FIG. 9, a device for competing random access is applied to a network side device, and the device 900 includes:

The second receiving module 901 is configured to receive the Msg1 message corresponding to the two-step contention random access sent by the terminal side device;

In this embodiment, optionally, the Msg1 message carries at least a Random Access Preamble, and a data part. Optionally, the data part includes but is not limited to one or a combination of the following: a terminal identifier, a scheduling request SR, a buffer status report BSR, and real service data.

Further, the Random Access Preamble and the data portion are frequency division multiplexed FDM or time division multiplexed TDM.

The second sending module 902 is configured to determine an Msg2 message according to the receiving condition of the received Msg1 message, and reply the Msg2 message to the terminal side device, if the terminal side device determines two-step competitive random access according to the Msg2 message. If the failure occurs, the terminal side device performs a two-step competitive random access failure process.

The receiving condition of the above Msg1 message can be divided into: First, the Random Access Preamble in the Msg1 message, and the data part are successfully received. Second, the Random Access Preamble in the Msg1 message was not successfully received, and the data portion was successfully received. Third, the Random Access Preamble in the Msg1 message, as well as the data portion, were not successfully received.

The reception status of the above Msg2 message can be divided into a case where an Msg2 message is received and a case where an Msg2 message is not received. The receiving the Msg2 message may refer to: receiving the Msg2 message corresponding to the four-step contention random access. If the Msg2 message is not received, the terminal device may not receive the Msg2 message before the Msg2 message receiving window or the timer corresponding to the Msg2 expires.

In this embodiment, the second sending module 902 is further configured to: if the Random Access Preamble and the data part in the Msg1 message corresponding to the two-step contention random access are successfully received, return the two-step contention random connection to the terminal side device. The corresponding Msg2 message is entered; or if only the Random Access Preamble is successfully received in the Msg1 message corresponding to the two-step contention random access, and the data part is not successfully received, the Msg2 receiving window or the timer corresponding to the Msg2 is timed out to the terminal side. The device replies to the Msg2 message corresponding to the four-step contention random access; or if only the Random Access Preamble and the data part are not successfully received in the Msg1 message corresponding to the two-step contention random access, the Msg2 message is not returned to the terminal side device.

In this embodiment, the second sending module 902 is further configured to: if the Random Access Preamble in the Msg1 message corresponding to the two-step contention random access is not successfully received, only the data part is successfully received, and the two-step competition is returned to the terminal side device. Random access to the corresponding Msg2 message.

In this embodiment, the RAPID in the Msg2 message uses a predetermined value, or uses a predetermined domain identifier in a RAR MAC PDU subheader or a MAC PDU.

In this embodiment, the apparatus further includes: a third sending module, configured to send configuration information of the two-step contention random access related parameter to the terminal side device.

In this embodiment, the two-step contention random access related parameter includes but is not limited to one or a combination of the following parameters:

The maximum number of transmissions of the Random Access Preamble, the backoff parameter of the retry after the random access failure, the power ramping step parameter in the random access procedure, and the behavior of the terminal side device after the failure of the Msg1 message.

In this embodiment, the maximum number of transmissions of the Random Access Preamble includes one or a combination of the following:

The maximum number of Random Access Preamble transmissions for the two-step contention random access, the total number of Random Access Preamble transmissions for the four-step contention random access, and the total number of total Random Access Preamble transmissions.

In this embodiment, for the two-step contention random access and the four-step contention random access, the network side device configures the same backoff parameter or configures different backoff parameters.

In this embodiment, for the two-step contending random access and the four-step contending random access, the network side device is configured with the same power ramping step parameter or configured with different power ramping step parameters; or

For the two-step contention random access, the power accessing step size of the Random Access Preamble and the data part in the Msg1 message corresponding to the two-step contention random access is different.

In this embodiment, the network side device determines how to reply to the Msg2 message according to the receiving condition of the Msg1 message, and the terminal side device performs two steps according to the reply condition of the Msg2 message of the network side device, if it is determined that the two-step contention random access fails. The process of competing random access provides a technical solution for determining the two-step random access failure processing, so that the random access process of the 5G system can be further improved.

Further, the terminal side device may further determine the subsequent processing manner of the two-step random calculation failure according to the reply condition of the Msg2 message of the network side device, so that the random access process of the 5G system can be more perfect.

Based on the same inventive concept, a terminal side device is further provided in the embodiment of the present disclosure. The principle of the terminal side device solving the problem is similar to the method for competing random access in FIG. 4 in the embodiment of the present disclosure, so the terminal side device is Implementation can refer to the implementation of the method, and the repetitions are not described.

Example 7

Referring to FIG. 10, an embodiment of the present disclosure provides a terminal side device, including:

The first processor 1004 is configured to read a program in the first memory 1005 and perform the following process:

Sending, by the first transceiver 1001, the Msg1 message corresponding to the two-step contention random access to the network side device;

The first transceiver 1001 receives the Msg2 message replied by the network side device. If the terminal side device determines that the two-step contention random access fails according to the receiving condition of the Msg2 message, the two-step contention random access failure process is performed. The Msg2 message is determined by the network side device according to the receiving condition that the network side device receives the Msg1 message.

The first transceiver 1001 is configured to receive and transmit data under the control of the first processor 1004.

In FIG. 10, a bus architecture (represented by first bus 1000) can include any number of interconnected buses and bridges, and first bus 1000 will include one or more processors and first represented by first processor 1004. The various circuits of the memory represented by memory 1005 are linked together. The first bus 1000 can also link various other circuits, such as peripherals, voltage regulators, and power management circuits, as is well known in the art, and therefore, will not be further described herein. The first bus interface 1003 provides an interface between the first bus 1000 and the first transceiver 1001. The first transceiver 1001 can be an element or a plurality of elements, such as a plurality of receivers and transmitters, providing means for communicating with various other devices on a transmission medium. The data processed by the first processor 1004 is transmitted over the wireless medium through the first transceiver 1001 and the first antenna 1002. Further, the first antenna 1002 also receives data and transmits the data to the first processing via the first transceiver 1001. 1004.

The first processor 1004 is responsible for managing the first bus 1000 and the usual processing, and can also provide various functions including timing, peripheral interfaces, voltage regulation, power management, and other control functions. The first memory 1005 can be used for data used by the first storage processor 1004 in performing operations. Specifically, the first processor 1004 may be a CPU, an ASIC, an FPGA, or a CPLD.

Optionally, the Msg1 message carries at least a Random Access Preamble, and a data part.

Optionally, the first processor 1004 is specifically configured to: if only the Random Access Preamble is successfully received by the network side device in the Msg1 message, and the data part is not successfully received by the network side device, the timing corresponding to the Msg2 message receiving window or the Msg2 message Before the timeout expires, the Msg2 corresponding to the four-step competitive random access replied by the network side device is received, and converted into four-step competitive random access.

Optionally, the first processor 1004 is specifically configured to: if the Random Access Preamble and the data part in the Msg1 message corresponding to the two-step contention random access are not successfully received, the terminal side device is in the Msg2 message receiving window or the Msg2 The timer corresponding to the message does not receive the Msg2 message before the timer expires, and continues to try the two-step competitive random access until:

Two-step competition for random access success; or

The maximum number of total Random Access Preamble transmissions configured by the network side device for the terminal side device is determined, and the contention random access failure is determined; or

In the two-step contending random access procedure, if only the Random Access Preamble is successfully received by the network side device in the Msg1 message corresponding to the two-step contending random access, and the data part is not successfully received by the network side device, the Msg2 message receiving window is received. Or the Msg2 message corresponding to the four-step contention random access replied by the network side device is received before the timer corresponding to the Msg2 message expires, and converted into four-step contention random access.

Optionally, the first processor 1004 is specifically configured to: if the Random Access Preamble and the data part in the Msg1 message corresponding to the two-step contention random access are not successfully received, the timer corresponding to the Msg2 message receiving window or the Msg2 message is timed out. Before receiving the Msg2 message, go directly to the four-step competitive random access and try until:

Four-step competition random access success; or

The maximum number of total Random Access Preamble transmissions configured by the network side device for the terminal side device is determined, and the contention random access failure is determined.

Optionally, the first processor 1004 is specifically configured to: if the Random Access Preamble and the data part in the Msg1 message corresponding to the two-step contention random access are not successfully received, the timer corresponding to the Msg2 message receiving window or the Msg2 message is timed out. Before receiving the Msg2 message, continue to try the two-step competitive random access until:

Two-step competition for random access success; or

After the maximum number of random access Preambles of the two-step contending random access configured by the network side device for the terminal side device is reached, the four-step contending random access is performed until the four-step contending random access succeeds, or the network side device is the terminal. The maximum number of transmissions of the total Random Access Preamble of the four-step contention random access configured by the side device determines that the contention random access fails; or

In the two-step contending random access procedure, if only the Random Access Preamble is successfully received by the network side device in the Msg1 message corresponding to the two-step contending random access, and the data part is not successfully received by the network side device, the Msg2 message receiving window is received. Or the Msg2 message corresponding to the four-step contention random access replied by the network side device is received before the timer corresponding to the Msg2 message expires, and converted into four-step contention random access.

Optionally, the data part includes but is not limited to one or a combination of the following: a terminal identifier, a scheduling request SR, a buffer status report BSR, and real service data.

Optionally, the Random Access Preamble and the data part are frequency division multiplexed FDM, or time division multiplexed TDM.

Optionally, the first processor 1004 is specifically configured to perform a two-step competitive random access attempt or a four-step competitive randomization according to a backoff parameter configured by the network side device to randomly roll back a time according to a backoff parameter configured by the network side device. Access attempt.

Optionally, the same backoff parameter is configured by the network side device or different backoff parameters are configured for the two-step contention random access and the four-step contention random access.

Optionally, adjusting the power ramping step parameter or configuring different power ramping step parameters for the two-step contention random access and the four-step contention random access by the network side device configured with the same output power; or

For the two-step contention random access, the power accessing step size of the Random Access Preamble and the data part in the Msg1 message corresponding to the two-step contention random access is different.

Optionally, the first processor 1004 is specifically configured to: if the terminal side device competes for random access and/or four-step contention random access, the total number of Random Access Preamble transmissions reaches the network side device for the terminal side device configuration. After the total number of total Random Access Preambles, the higher layer is instructed to contend for the random access problem, and the higher layer determines that the terminal side device wireless link access fails.

Optionally, the first transceiver is further configured to receive configuration information of the two-step contention random access related parameter of the network side device.

Optionally, the two-step contention random access related parameter includes but is not limited to one or a combination of the following parameters:

The maximum number of transmissions of the Random Access Preamble, the backoff parameter that is tried again after the random access failure, the power ramping step parameter in the random access procedure, and the part or all of the Msg1 message accept the behavior of the terminal side device after the failure.

Optionally, the maximum number of transmissions of the Random Access Preamble includes one or a combination of the following:

The maximum number of Random Access Preamble transmissions for the two-step contention random access, the total number of Random Access Preamble transmissions for the four-step contention random access, and the total number of total Random Access Preamble transmissions.

Optionally, the behavior of the terminal side device after the partial or total acceptance of the Msg1 message fails includes, but is not limited to, the terminal side device continues to try the two-step contention random access, or the terminal side device continues to try the four-step contention random access. Or the terminal side device attempts N times two-step contending random access, and if it fails, tries four-step contending random access, where N is the maximum number of Random Access Preamble transmissions of the two-step contending random access.

Based on the same inventive concept, a network side device device is further provided in the embodiment of the present disclosure. The principle of solving the problem in the network side device device is similar to the method for competing random access in FIG. 5 in the embodiment of the present disclosure, so the network side is The implementation of the equipment can be referred to the implementation of the method, and the repetition is not described.

Example eight

Referring to FIG. 11 , an embodiment of the present disclosure provides a network side device, including

The second processor 1104 is configured to read the program in the second memory 1105 and perform the following process:

Receiving, by the second transceiver 1101, the Msg1 message corresponding to the two-step contention random access sent by the terminal side device;

Receiving the Msg2 message by receiving the Msg1 message by the second transceiver 1101, and returning the Msg2 message to the terminal side device, if the terminal side device determines the two-step contention random access according to the receiving condition of the Msg2 message If the failure occurs, the terminal side device performs a two-step competitive random access failure process.

The second transceiver 1101 is configured to receive and transmit data under the control of the second processor 1104.

In FIG. 11, the bus architecture (represented by the second bus 1100) may include any number of interconnected buses and bridges, and the second bus 1100 will include one or more processors and seconds represented by the first processor 1104. The various circuits of the memory represented by memory 1105 are linked together. The second bus 1100 can also link various other circuits, such as peripherals, voltage regulators, and power management circuits, as is known in the art, and therefore, will not be further described herein. The second bus interface 1103 provides an interface between the second bus 1100 and the second transceiver 1101. The second transceiver 1101 can be an element or a plurality of elements, such as a plurality of receivers and transmitters, providing means for communicating with various other devices on a transmission medium. The data processed by the second processor 1104 is transmitted over the wireless medium through the second transceiver 1101 and the second antenna 1102. Further, the second antenna 1102 also receives the data and transmits the data to the first process via the second transceiver 1101. 1104.

The second processor 1104 is responsible for managing the second bus 1100 and the usual processing, and can also provide various functions including timing, peripheral interfaces, voltage regulation, power management, and other control functions. The second memory 1105 can be used for data used by the second storage processor 1104 in performing operations. Specifically, the second processor 1104 can be a CPU, an ASIC, an FPGA, or a CPLD.

Optionally, the second processor 1104 is specifically configured to:

If the Random Access Preamble and the data part of the Msg1 message corresponding to the two-step contention random access are successfully received, the Msg2 message corresponding to the two-step contention random access is returned to the terminal side device; or

If only the Random Access Preamble is successfully received and the data part is not successfully received in the Msg1 message corresponding to the two-step contention random access, the four-step competition is returned to the terminal side device before the timer corresponding to the Msg2 message receiving window or the Msg2 message expires. Random access to the corresponding Msg2 message; or

If only the Random Access Preamble and the data part are not successfully received in the Msg1 message corresponding to the two-step contention random access, the Msg2 message is not returned to the terminal side device.

Optionally, the second processor 1104 is specifically configured to:

If the Random Access Preamble in the Msg1 message corresponding to the two-step contention random access is not successfully received, only the data part is successfully received, and the Msg2 message corresponding to the two-step contention random access is returned to the terminal side device.

Optionally, the RAPID in the Msg2 message uses a predetermined value, or uses a predetermined domain identifier in a RAR MAC PDU subheader or a MAC PDU.

Optionally, in this embodiment, the second transceiver 1101 is further configured to: send configuration information of the two-step contention random access related parameter to the terminal side device.

Optionally, the two-step contention random access related parameter includes but is not limited to one or a combination of the following parameters:

The maximum number of transmissions of the Random Access Preamble, the backoff parameter of the retry after the random access failure, the power ramping step parameter in the random access procedure, and the behavior of the terminal side device after the failure of the Msg1 message.

Optionally, the maximum number of transmissions of the Random Access Preamble includes one or a combination of the following:

The maximum number of Random Access Preamble transmissions for the two-step contention random access, the total number of Random Access Preamble transmissions for the four-step contention random access, and the total number of total Random Access Preamble transmissions.

Optionally, for the two-step contention random access and the four-step contention random access, the network side device configures the same backoff parameter or configures different backoff parameters.

Optionally, for the two-step contending random access and the four-step contending random access, the network side device is configured with the same power ramping step parameter or configured with different power ramping step parameters; or

For the two-step contention random access, the power accessing step size of the Random Access Preamble and the data part in the Msg1 message corresponding to the two-step contention random access is different.

It is to be understood that the phrase "one embodiment" or "an embodiment" or "an" or "an" Thus, "in one embodiment" or "in an embodiment" or "an" In addition, these particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

In various embodiments of the present disclosure, it should be understood that the size of the serial numbers of the above processes does not mean the order of execution, and the order of execution of each process should be determined by its function and internal logic, and should not be taken to the embodiments of the present disclosure. The implementation process constitutes any limitation.

Additionally, the terms "system" and "network" are used interchangeably herein.

It should be understood that the term "and/or" herein is merely an association relationship describing an associated object, indicating that there may be three relationships, for example, A and/or B, which may indicate that A exists separately, and A and B exist simultaneously. There are three cases of B alone. In addition, the character "/" in this article generally indicates that the contextual object is an "or" relationship.

In the embodiment provided by the present application, it should be understood that "B corresponding to A" means that B is associated with A, and B can be determined according to A. However, it should also be understood that determining B from A does not mean that B is only determined based on A, and that B can also be determined based on A and/or other information.

In the several embodiments provided in the present application, it should be understood that the disclosed method and apparatus may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.

In addition, each functional unit in various embodiments of the present disclosure may be integrated into one processing unit, or each unit may be physically included separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of hardware plus software functional units.

The above-described integrated unit implemented in the form of a software functional unit can be stored in a computer readable storage medium. The above software functional unit is stored in a storage medium and includes a plurality of instructions for causing a computer device (which may be a personal computer, a server, or a network side device device, etc.) to perform part of the steps of the transceiving method of the various embodiments of the present disclosure. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, and the program code can be stored. Medium.

The above is a preferred embodiment of the present disclosure, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present disclosure. Within the scope of protection of the present disclosure.

Claims (54)

A competitive random access method includes: The terminal side device sends the Msg1 message corresponding to the two-step contention random access to the network side device; The terminal side device receives the Msg2 message replied by the network side device, and if the terminal side device determines that the two-step contention random access fails according to the receiving condition of the Msg2 message, performing a two-step contention random access failure process; The Msg2 message is determined by the network side device according to the receiving condition that the network side device receives the Msg1 message. The method of claim 1 wherein said Msg1 message carries at least a Random Access Preamble, and a data portion. The method of claim 2, wherein If only the Random Access Preamble is successfully received by the network side device in the Msg1 message, and the data part is not successfully received by the network side device, the terminal side device receives the network side device reply before the Msg2 message receiving window or the timer corresponding to the Msg2 message times out. The four-step competition random access corresponds to Msg2, which translates into four-step competitive random access. The method of claim 2, wherein If the Random Access Preamble and the data part of the Msg1 message corresponding to the two-step contention random access are not successfully received, the terminal side device does not receive the Msg2 before the timer corresponding to the Msg2 message receiving window or the Msg2 message expires. The terminal side device continues to try two-step competitive random access until: Two-step competition for random access success; or The maximum number of total Random Access Preamble transmissions configured by the network side device for the terminal side device is determined, and the contention random access failure is determined; or In the two-step contending random access process, if only the Random Access Preamble is successfully received by the network side device and the data part is not successfully received by the network side device, the terminal side device is successfully received by the network side device. The Msg2 message corresponding to the four-step contention random access replied by the network side device is received before the timer corresponding to the Msg2 message receiving window or the Msg2 message expires, and the terminal side device is converted into four-step contention random access. The method of claim 2, wherein If the Random Access Preamble and the data part of the Msg1 message corresponding to the two-step contention random access are not successfully received, the terminal side device does not receive the Msg2 message before the timer corresponding to the Msg2 message receiving window or the Msg2 message expires. The terminal side device directly goes to the four-step competitive random access to try until: Four-step competition random access success; or The maximum number of total Random Access Preamble transmissions configured by the network side device for the terminal side device is determined, and the contention random access failure is determined. The method of claim 2, wherein If the Random Access Preamble and the data part of the Msg1 message corresponding to the two-step contention random access are not successfully received, the terminal side device does not receive the Msg2 message before the timer corresponding to the Msg2 message receiving window or the Msg2 message expires. The terminal side device continues to try two-step competitive random access until: Two-step competition for random access success; or After the maximum number of random access Preambles of the two-step contending random access configured by the network side device for the terminal side device is reached, the four-step contending random access is performed until the four-step contending random access succeeds, or the network side device is the terminal. The maximum number of transmissions of the total Random Access Preamble of the four-step contention random access configured by the side device determines that the contention random access fails; or In the two-step contending random access process, if only the Random Access Preamble is successfully received by the network side device and the data part is not successfully received by the network side device, the terminal side device is successfully received by the network side device. The Msg2 message corresponding to the four-step contention random access replied by the network side device is received before the timer corresponding to the Msg2 message receiving window or the Msg2 message expires, and the terminal side device is converted into four-step contention random access. The method according to any one of claims 2 to 6, wherein the data portion includes, but is not limited to, one or a combination of: a terminal identification, a scheduling request SR, a cache status report BSR, and real service data. The method according to any one of claims 2 to 6, wherein the Random Access Preamble and data portion is a frequency division multiplexed FDM or a time division multiplexed TDM. The method according to any one of claims 1 to 8, wherein Each time the contention random access fails, the terminal side device randomly performs a two-step competitive random access attempt or a four-step competitive random access attempt according to the backoff backoff parameter configured by the network side device. The method according to claim 9, wherein the same backoff parameter is configured by the network side device or a different backoff parameter is configured for the two-step contention random access and the four-step contention random access. The method according to any one of claims 1 to 10, wherein the power supply stepping parameter is adjusted or configured differently by the network side device configured for the two-step contention random access and the four-step contention random access. Power ramping step parameter; or For the two-step contention random access, the power accessing step size of the Random Access Preamble and the data part in the Msg1 message corresponding to the two-step contention random access is different. The method according to any one of claims 1 to 11, wherein If the total number of Random Access Preamble transmissions of the two-step contention random access and/or the four-step contention random access of the terminal device reaches the total number of total Random Access Preambles configured by the network side device for the terminal side device, Indicates a contention random access problem, and the high layer determines that the terminal side device radio link fails. The method of any of claims 1 to 12, wherein the method further comprises: The terminal side device receives configuration information of a two-step contention random access related parameter of the network side device. The method of claim 13, wherein the two-step contention random access related parameter comprises, but is not limited to, one or a combination of the following parameters: The maximum number of transmissions of the Random Access Preamble, the backoff parameter of the retry after the random access failure, the power ramping step parameter in the random access procedure, and the behavior of the terminal side device after the failure of the Msg1 message. The method according to claim 14, wherein the maximum number of transmissions of the Random Access Preamble comprises one or a combination of the following: The maximum number of Random Access Preamble transmissions for the two-step contention random access, the total number of Random Access Preamble transmissions for the four-step contention random access, and the total number of total Random Access Preamble transmissions. The method according to claim 14, wherein the behavior of the terminal side device after the partial or total acceptance of the Msg1 message fails includes, but is not limited to, the terminal side device continues to try the two-step contention random access, or the terminal side device continues to try. Four-step random access, or the terminal-side device attempts N-time two-step competitive random access. If it fails, try four-step competitive random access, where N is the maximum number of Random Access Preamble transmissions for the two-step competitive random access. . A competitive random access method includes: The network side device receives the Msg1 message corresponding to the two-step contention random access sent by the terminal side device; Determining, by the network side device, the Msg2 message according to the receiving condition of the Msg1 message, and replying the Msg2 message to the terminal side device, if the terminal side device determines the two-step competitive random access according to the receiving condition of the Msg2 message If the failure occurs, the terminal side device performs a two-step competitive random access failure process. The method of claim 17, wherein If the Random Access Preamble and the data part of the Msg1 message corresponding to the two-step contention random access are successfully received, the network side device replies to the terminal side device with the Msg2 message corresponding to the two-step contention random access; or If only the Random Access Preamble is successfully received and the data part is not successfully received in the Msg1 message corresponding to the two-step contention random access, the network side device sends the Msg2 message receiving window or the timer corresponding to the Msg2 message to the terminal side before the timer expires. The device replies to the Msg2 message corresponding to the four-step competitive random access; or If only the Random Access Preamble and the data part are not successfully received in the Msg1 message corresponding to the two-step contention random access, the network side device does not reply the Msg2 message to the terminal side device. The method of claim 17, wherein If the Random Access Preamble in the Msg1 message corresponding to the two-step contention random access is not successfully received, and only the data part is successfully received, the network side device replies to the terminal side device with the Msg2 message corresponding to the two-step contention random access. The method according to any one of claims 17 to 19, wherein the RAPID in the Msg2 message uses a predetermined value or uses a predetermined domain identifier in a RAR MAC PDU subheader or a MAC PDU. The method of any of claims 17 to 20, wherein the method further comprises: The network side device sends configuration information of the two-step contention random access related parameter to the terminal side device. The method of claim 21, wherein the two-step contention random access related parameter comprises, but is not limited to, one or a combination of the following parameters: The maximum number of transmissions of the Random Access Preamble, the backoff parameter of the retry after the random access failure, the power ramping step parameter in the random access procedure, and the behavior of the terminal side device after the failure of the Msg1 message. The method according to claim 22, wherein the maximum number of transmissions of the Random Access Preamble comprises one or a combination of the following: The maximum number of Random Access Preamble transmissions for the two-step contention random access, the total number of Random Access Preamble transmissions for the four-step contention random access, and the total number of total Random Access Preamble transmissions. The method according to any one of claims 17 to 23, wherein, for the two-step contention random access and the four-step contention random access, the network side device configures the same backoff parameter or configures a different backoff parameter. The method according to any one of claims 17 to 24, wherein, for the two-step contention random access and the four-step contention random access, the network side device configures the same power ramping step parameter or configures a different power ramping step. Long parameter; or For the two-step contention random access, the power accessing step size of the Random Access Preamble and the data part in the Msg1 message corresponding to the two-step contention random access is different. A device for competing random access, which is applied to a terminal side device, and includes: a first sending module, configured to send, to the network side device, a two-step Msg1 message corresponding to the random access; and The first processing module is configured to receive the Msg2 message replied by the network side device, and if the terminal side device determines that the two-step contending random access fails according to the receiving condition of the Msg2 message, performing a two-step contending random access failure process; The Msg2 message is determined by the network side device according to the receiving condition that the network side device receives the Msg1 message. The apparatus of claim 26, wherein the Msg1 message carries at least a Random Access Preamble, and a data portion. The apparatus of claim 27, wherein the first processing module is further configured to: If only the Random Access Preamble is successfully received by the network side device in the Msg1 message, and the data part is not successfully received by the network side device, the four-step contention randomized by the network side device is received before the timer corresponding to the Msg2 message receiving window or the Msg2 message times out. Access the corresponding Msg2 and convert it to four-step competitive random access. The apparatus of claim 27, wherein the first processing module is further configured to: If the Random Access Preamble and the data part of the Msg1 message corresponding to the two-step contention random access are not successfully received, the terminal side device does not receive the Msg2 message before the timer corresponding to the Msg2 message receiving window or the Msg2 message expires. Continue to try two-step competitive random access until: Two-step competition for random access success; or The maximum number of total Random Access Preamble transmissions configured by the network side device for the terminal side device is determined, and the contention random access failure is determined; or In the two-step contending random access procedure, if only the Random Access Preamble is successfully received by the network side device in the Msg1 message corresponding to the two-step contending random access, and the data part is not successfully received by the network side device, the Msg2 message receiving window is received. Or the Msg2 message corresponding to the four-step contention random access replied by the network side device is received before the timer corresponding to the Msg2 message expires, and converted into four-step contention random access. The apparatus of claim 27, wherein the first processing module is further configured to: If the Random Access Preamble and the data part of the Msg1 message corresponding to the two-step contention random access are not successfully received, the Msg2 message is not received before the timer corresponding to the Msg2 message receiving window or the Msg2 message times, and the process directly goes to the four-step competition. Random access is attempted until: Four-step competition random access success; or The maximum number of total Random Access Preamble transmissions configured by the network side device for the terminal side device is determined, and the contention random access failure is determined. The apparatus of claim 27, wherein the first processing module is further configured to: If the Random Access Preamble and the data part of the Msg1 message corresponding to the two-step contention random access are not successfully received, the Msg2 message is not received before the timer corresponding to the Msg2 message receiving window or the Msg2 message expires, and the two-step random competition is continued. Access until: Two-step competition for random access success; or After the maximum number of random access Preambles of the two-step contending random access configured by the network side device for the terminal side device is reached, the four-step contending random access is performed until the four-step contending random access succeeds, or the network side device is the terminal. The maximum number of transmissions of the total Random Access Preamble of the four-step contention random access configured by the side device determines that the contention random access fails; or In the two-step contending random access procedure, if only the Random Access Preamble is successfully received by the network side device in the Msg1 message corresponding to the two-step contending random access, and the data part is not successfully received by the network side device, the Msg2 message receiving window is received. Or the Msg2 message corresponding to the four-step contention random access replied by the network side device is received before the timer corresponding to the Msg2 message expires, and converted into four-step contention random access. The apparatus according to any one of claims 27 to 31, wherein the data portion includes, but is not limited to, one or a combination of: a terminal identification, a scheduling request SR, a buffer status report BSR, and real service data. The apparatus according to any one of claims 27 to 32, wherein the Random Access Preamble and data portion is a frequency division multiplexed FDM or a time division multiplexed TDM. The apparatus according to any one of claims 26 to 33, wherein the first processing module is further configured to: Each time the contention random access fails, the two-step competitive random access attempt or the four-step competitive random access attempt is performed again according to the backoff parameter configured by the network side device. The apparatus according to claim 34, wherein the same backoff parameter is configured by the network side device or a different backoff parameter is configured for the two-step contention random access and the four-step contention random access. The apparatus according to any one of claims 26 to 35, wherein the power ramping step size parameter is adjusted by the network side device configured for the same output power for the two-step contention random access and the four-step contention random access or Configure different power ramping step parameters; or For the two-step contention random access, the power accessing step size of the Random Access Preamble and the data part in the Msg1 message corresponding to the two-step contention random access is different. The apparatus according to any one of claims 26 to 36, wherein the first processing module is further configured to: If the total number of Random Access Preamble transmissions of the two-step contention random access and/or the four-step contention random access of the terminal device reaches the total number of total Random Access Preambles configured by the network side device for the terminal side device, Indicates a contention random access problem, and the high layer determines that the terminal side device radio link fails. The device according to any one of claims 26 to 37, wherein the device further comprises: The first receiving module is configured to receive configuration information of the two-step contention random access related parameter of the network side device. The apparatus of claim 38, wherein the two-step contention random access related parameter comprises, but is not limited to, one or a combination of the following parameters: The maximum number of transmissions of the Random Access Preamble, the backoff parameter of the retry after the random access failure, the power ramping step parameter in the random access procedure, and the behavior of the terminal side device after the failure of the Msg1 message. The apparatus according to claim 39, wherein the maximum number of transmissions of the Random Access Preamble comprises one or a combination of the following: The maximum number of Random Access Preamble transmissions for the two-step contention random access, the total number of Random Access Preamble transmissions for the four-step contention random access, and the total number of total Random Access Preamble transmissions. The apparatus according to claim 39, wherein the behavior of the terminal side device after the partial or total acceptance of the Msg1 message fails includes, but is not limited to, the terminal side device continues to try two-step contention random access, or the terminal side device continues to try Four-step random access, or the terminal-side device attempts N-time two-step competitive random access. If it fails, try four-step competitive random access, where N is the maximum number of Random Access Preamble transmissions for the two-step competitive random access. . A device for competing random access, which is applied to a network side device, and includes: a second receiving module, configured to receive a Msg1 message corresponding to the two-step contention random access sent by the terminal side device; a second sending module, configured to determine an Msg2 message according to the receiving condition of the received Msg1 message, and reply the Msg2 message to the terminal side device, if the terminal side device determines that the two-step competition is random according to the receiving condition of the Msg2 message If the access fails, the terminal side device performs a two-step competitive random access failure process. The apparatus of claim 42, wherein the second transmitting module is further configured to: If the Random Access Preamble and the data part of the Msg1 message corresponding to the two-step contention random access are successfully received, the Msg2 message corresponding to the two-step contention random access is returned to the terminal side device; or If only the Random Access Preamble is successfully received and the data part is not successfully received in the Msg1 message corresponding to the two-step contention random access, the four-step competition is returned to the terminal side device before the timer corresponding to the Msg2 message receiving window or the Msg2 message expires. Random access to the corresponding Msg2 message; or If only the Random Access Preamble and the data part are not successfully received in the Msg1 message corresponding to the two-step contention random access, the Msg2 message is not returned to the terminal side device. The apparatus of claim 42, wherein the second transmitting module is further configured to: If the Random Access Preamble in the Msg1 message corresponding to the two-step contention random access is not successfully received, only the data part is successfully received, and the Msg2 message corresponding to the two-step contention random access is returned to the terminal side device. The apparatus according to any one of claims 42 to 44, wherein the RAPID in the Msg2 message uses a predetermined value or uses a predetermined domain identifier in a RAR MAC PDU subheader or a MAC PDU. The apparatus of any one of claims 42 to 45, wherein the apparatus further comprises: The third sending module is configured to send configuration information of the two-step contention random access related parameter to the terminal side device. The apparatus of claim 46, wherein the two-step contention random access related parameter comprises, but is not limited to, one or a combination of the following parameters: The maximum number of transmissions of the Random Access Preamble, the backoff parameter of the retry after the random access failure, the power ramping step parameter in the random access procedure, and the behavior of the terminal side device after the failure of the Msg1 message. The apparatus according to claim 47, wherein the maximum number of transmissions of the Random Access Preamble comprises one or a combination of the following: The maximum number of Random Access Preamble transmissions for the two-step contention random access, the total number of Random Access Preamble transmissions for the four-step contention random access, and the total number of total Random Access Preamble transmissions. The apparatus according to any one of claims 42 to 48, wherein, for the two-step contention random access and the four-step contention random access, the network side device configures the same backoff parameter or configures a different backoff parameter. The apparatus according to any one of claims 42 to 49, wherein, for two-step contention random access and four-step contention random access, the network side device configures the same power ramping step parameter or configures a different power ramping step Long parameter; or For the two-step contention random access, the power accessing step size of the Random Access Preamble and the data part in the Msg1 message corresponding to the two-step contention random access is different. A terminal side device comprising: a processor, a memory, and a computer program stored on the memory and operable on the processor, the computer program being executed by the processor to implement the claims 1 to 16 The step in the contention random access method of any of the above. A network side device comprising: a processor, a memory, and a computer program stored on the memory and operable on the processor, the computer program being executed by the processor to implement the claims 17 to 25 The step in the contention random access method of any of the above. A computer readable storage medium having stored thereon a computer program, the computer program being executed by a processor to implement the contention random access method according to any one of claims 1 to 16. A step of. A computer readable storage medium having stored thereon a computer program, the computer program being executed by a processor, implementing the contention random access method according to any one of claims 17 to 25 A step of.

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